Pulp-beater.



S. MITCHELL.

PULP HEATER.

MPu'cmon man 1AN.25.1918.

Patented Sept. 3,1918..

2 SHEETSYSHEE! L S. MITCHELL.

PULP BEATER.

APrucArloN mm um. 25. 151B.

Patented Sept. 3, 1918.

2 SHEETS-SHEET 2 ATTO R N EYS f-- UNITED STATES PATENT OFFICE.

SIDNEY MITCHELL, OF NEW YORK, N. Y.

PULP-IBEATER.

Application filed January 25, 1918.

To all whom t may concern.

lie it known that I, Swain' MrronnLL, a citizen ot' the United States, residingl at New York, in the county of New York and State ot New York, have invented certain new and useful Improvements in Pulp- Heaters; and l do hereby declare the following to he a full, clear, and exact description ot the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to characters ol reference marked thereon, which form a part of this specification.

T he present invention relates, generally, to improvements in pulp beating machines commonly employed in the paper manufacturing industry; and the invention has reference, more particularly, to an improved construction el beater or breaker adapted to beat and tease out the fibers of the raw material to produce a proper pulp requisite to the carrying on of paper manufacture.

The invention has for its principal object to provide a means in connection with the heater mechanism for separating and discharging such portion of the raw material as has heen properly beaten out or pulped, while still retaining that portion of the saine, subject to the further action of the beater mechanism, which requires further treatment to reduce the same to the proper beaten or pulped condition, thus rendering the operation of the machine more or less continuous in its discharge of pulp, and eliminating the necessity ot' working over and over that portion of the raw material which has been properly reduced while awaiting the reduction of the more resistant portions of the same, thereby saving both time and energy.

The invention has for a further object to provide a novel construction of automatic separating means, per Se, for heaters or breakers, comprising a novel arrangement of screens or gratings through which the finished pulp flows, and a novel means for clearing;l the screens or gratings to prevent clogging or olzstruetion of the interstices ot' thc same.

Other objects ot the present invention, not at this time more particularly enumerated, will he clearly uinlcrsteod from the followinn detailed description ot the same.

The invia-.tion consists, primarily` in the novel construction of beater or breaker here- Specification of Letters Patent.

Patented Sept. 3, 1918.

serial No. 213,674.

inafter set forth; and the invention consists, furthermore, in the novel arrangements and combinations of the various devices and parts, as well as in the details of the construction of the said parts, all of which' will bc hereinafter more fully described, and then finally defined in the appended claims.

The invention is clearly illustrated in the accompanying drawings, in which:-

Figure l is a plan view of a beater or breaker made according to and embodying the principles of my present invention, a portion of the hood inclosing the beater roll being broken away.

Fie. 2 is a vertical longitudinal section of the saine, taken on line Q-2 in said Fig. 1.

Fig. 3 is a vertical transverse section of the same, taken on liuc 3 3 in said Fig. 2 looking' toward the beater roll.

Fig. l is a detail view of a portion of the main separating screens or gratings drawn ou an enlarged scale, and the saine heilig shown in partial longitudinal section.

Fig. 5 is a detail cross section taken on line 5 5 in said Fig. ll, said view being drawn on a further enlarged scale.

Fig. G is a detail View oi*I a portion of the auxiliary separating screen or grating drawn on an enlarged scale, and the same being;- shown in partial longitudinal section.

Similar characters of reference are einployed in all of the hereinabove described views, to indicate corresponding parts.

Referring now to said drawings, the reference character 1 indicates the usual beater tub in which the beater mechanism and the novel separating devices are mounted, and in which the raw material to be pulped and the water for softening the same, and assisting its circulation around the tub to the beater' roll, is received. Arranged within the' tub is the usual mid-feather 2 which terminatos short of l,ach end of the tub, and which serves to properly divide the tub to provide the desired continuous circulatory passage therein. Mounted between one side wall of said tub and .Jaid mid-feather 2 is the usual beater roll 3, havingthe series of radially projecting fly-bars Ll on its circumference. A transversely journaled driving shaft 5 is mounted in connection with said tub upon which the roll 3 is fixed, said .shaft being;- provided with a suitable belt pulley 6, or other suitable means for driving the same. Arranged beneath said beater roll 3 is any desired form of base-plate 7, with which the beater roll cooperates in beating out the raw material into the required pulp. Extending over the exposed upper portion ot' the beater roll 3 is au inclosing hood S, having a portion substantially concentric to the circumference of the beater roll 3 in which is provided a transverse discharge opening 9. Arranged cxteriorly in front of and beneath said discharge opening t) is a discharge trough or conduit 10 which may extend 1n a slight downwardly sloping inclination to and beyond either side of the tub 1 as may be desired.

Secured exteriorly upon said hood 8, above and adjacent to each. end of said opening i), are bearing portions or brackets 11. Supported by said brackets 11, in transverse extension above said opening 9, is a water pipe or conduit 12 leading from a suitable source of water supply.

The main separating screen or grating comprises a series of suspended rods or bars 13, having at their upper' ends an eye-portioif 14 or other suitable means for pivotally suspending the same from said pipe or conduit 1Q. As thus suspended, the said rods or bars 13 extend downwardly across and through said discharge opening 9, their free ends being located within said opening 9, and normally spa-ced slightly away from the lower marginal edge of the latter. Prefera- 4bly said rods or bars 13 are secured together in indemndentlyv movable groups by means of cross-pins 15 extending through the same, which also serve to space the rods or bars laterally apart to provide the requisite interstices or passages 16 of narrow Width between the same. The said Water pipe 12 is provided with outlet or discharge openings 17 in its under side, and so located as to assure a washing flow of water emitted therefrom along the surface of each rod or bar 13. Preferably each bar or rod 13 is bent laterally to incline the same obliquely in one direction.

Secured within said hood 8, above and adjacent to each end of said opening 9 are bracket members 18 to and between which is secured a supporting-bar 19 from which are suspended in fixed relation thereto a series of laterally spaced rods or bars 2O providing an auxiliary grating or screen, the intervening interstices 21 of which are comparatively large or Wide. Said rods or bars 2() are bent laterally so as to incline the saine obliquely in a direction opposite to the inclination of the bars or rods 13 of the main screen or grating. As thus disposed the auxiliary grating or screen is interposed between the beater-roll and the main screen or grating.

In operating the device the tub 1 is filled with water, and the raW material to be pulped is deposited therein. The beater roll 3 is then set in motion. The rotation of the beater roll acts as a paddle upon the Water in the tub, causing the same to circulate around the tub in the path defined by the walls oi the tub and the mid-feather 2. The circulatory iiow of the water thus set up carries the raw material between the beater roll and the base plate 7 in the usual manner, thereby causing the reduction of the raw material into a {ibrous mass, Which with the water in which it is carried produces the pulp desired. The nature of the raw material is such that almost immediately some portions thereof are reduced to the necessary pulpy mass, While other portions, being more resistant, are not so reduced until, during the circulation through the tub they are carried many times into contact with the beater roll. In most constructions of beaters, as hereto-tore used, it is necessary to permit the properly reduced portions of the raw material to contin ue in circulation With the rest of the mass until the whole batch is entirely reduced. This necessity entails both loss of time and energy. Vith my construction of novel separating means in combination With the beater proper, however, the properly reduced pr pulped portions of the raw material are, in a large part, separated from the more resistant mass and discharged continuously from the hood ready for use, leaving the more resistant mass for further treatment, until it too is gradually reduced and discharged. This separation is effected as follows. During the rotation of the beater roll a certain amount of Water and pulped raw material is carried around with the same, the latter being thrown outwardly by centrifugal force from the circumference of the roll. The out flying portions of the pulp are precipitated toward the auxiliary grating, formed by the bars or rods 20, and pass ing through the interstices 21 therebetween, are thrown against the main screen or rating formed by the bars or rods 13. It; any raw material not properly reduced, strings, or other non-pulped material are thrown off by the beater roll the Same are caught by the said auxiliary screen or grating and held back until, by the action of gravity, they drop back into the tub. Such pulped material as passes the auxiliary screen or grating engages the main screen or grating, and if properly reduced to a fine enough condition, passes through the interstices of the same, and thence into the trough 10, being thence discharged from the beater ma chine. Such material as is still too coarse to pass through the interstices of said main screen or grating, and which is consequently not sufiiciently reduced or pulped to be ready for discharge, is lodged upon the bars or rods 13 and held back, so that the same drops back into the tub 1. In order to prevent such too coarse material from clogging and obstructing the interstices between the rods or bars 13, and to assist in the rapid dropping of the same back into the tub 1, the water pipe 12 is arranged to discharge through the outlet opening 17 a sufficient quantity of water to maintain a downwardly flowing wash along each bar or rod 13. This wash of water not only prevents sticking of the reduced and partly reduced pulp to the rods or bars 13, but tends to wash down the too coarse portions of the same toward the ends of the rods and bars, so that it quickly drops back into the tub 1. In order to further assist the dropping back into the tuo 1 of the coarse pulp for further reduction, the rods or bars are secured together in independently movable groups, and pivotally swung from the water pipe so as to be capable of a free oscillatory movement. Consequently as the material thrown off by centrifugal force, flies through the auxiliary screen or grating into Contact with the main screen or grating, the impact thereof upon the latter tends to set each group of independently movable rods or bars 13 in swinging motion whereby the free ends of the latter are carried into contact with the lower marginal edge of the opening 9, and are intermittently tapped against said edge, thereby causing a vibration or jar to be imparted to said rods or bars tending to quickly dislodge any coarse material which resists gravity and the flowing wash of water, so that the bars or rods are kept clean and the interstices therebetween open to the continuous passage therethrough of properly reduced or pulped material into the discharge trough.

By inclining the bars or rods of said auxiliary grating or screen obliquely in one direction, and the bars or rods of the main grating or screen obliquely in the opposite direction, too great an exposure of open space in longitudinal extent, is eliminated, and the certain stoppage of too coarse pulp assured.

It will be apparent from the above description that the discharge of properly reduced pulp will be practically continuous during the operation of the beater, and that by removing properly reduced pulp from the mass of raw material circulating in the tub, the more resistant portions of the said raw material will thereupon have opportunity for more intimate contact with the beater roll, thus assuring a more rapid reduction of the same, with a consequent further saving of time and energy.

I am aware that some changes may be made in the general arrangements and comlbinations of the devices and parts, as well as in the details of the construction of the same, without departing from the scope of my invention as described in the foregoing speeicatien, and es defined in the claims appended hereto. Hence, I do not limit my invention to the exact arrangements and combinations of the devices and parts as set forth in the foregoing specification, nor do I confine myself to the exact details of the construction of said parts as illustrated in the accompanying drawings.

I claim 1. In a device of the kind described, a tub, a beater roll therein, a hood inclosing said beater roll having a discharge opening therein, a grating comprising a plurality of closely spaced bars extending over said discharge opening, means for flooding said grating with water, and a trough exteriorly arranged relative to said discharge opening and said grating to receive pulp discharged through the latter by centrifugal force from said beater roll.

2. In a device of the kind described, a tub, a beater roll therein, a hood inclosing said beater roll having a discharge opening therein, a grating comprising a plurality of closely spaced bars extending over said discharge opening, means for flooding said grating with water, an auxiliary grating comprising a plurality of comparatively widely spaced bars interposed between said beaterl roll and said first mentioned grating, and a trough exteriorly arranged relative to said discharge opening to receive pulp discharged through said respective gratings and said opening by centrifugal force from said beater roll.

3. In a device of the kind described, a tub, a beater roll therein, a hood inclosing said beater roll having a discharge opening therein, a grating comprising a plurality of' closely spaced bars, means for pivotally suspending said bars, said bars extending downwardly across said discharge opening so that their free ends may be disposed in swinging contact with the lower marginal edge of said discharge opening, means for flooding said bars with a continuous wash of water, and a trough exteriorly arranged relative to said discharge opening and said grating to receive pulp discharged through the latter by centrifugal force from said beater roll.

4. In a device of the kind described, a tub, a. beater roll therein, a hood inclosing said beater roll having a discharge opening therein, a grating comprising a plurality of closely spaced bars, means for pivotally suspending said bars, said hars extending downwardly across said discharge opening so that their free ends may be in swinging contact with the lower marginal edge of said dis charge opening, means for flooding said bars with a continuous wash of water, an auxiliary grating comprising a plurality of comparatively widely spaced bars interposed between said beater roll and said first mentioned grating, and a trough exteriorly arranged relatve to said discharge opening to receive pulp discharged through said rcspective gratings and said opening by centrifugal force from said beater roll.

5. In a device of the kind described, a tub, a beater roll therein, a hood inclosing said beater roll having a discliarge opening therein, bracket members on said hood above and adjacent to the ends of said discharge opening, a water supply pipe extending transversely between said bracket members, a plurality of closely spaced bars pivotally suspended from said water pipe so that they hang across said discharge openlng with their free ends within the saine, said water pipe having outlet openings adapted to discharge a stream of water to fiow along cach bar, and a trough exteriorly arranged relative to said discharge opening to receive pulp discharged through the interstices between said bars by centrifugal force from said beater roll.

6. In a device of the kind described, a tub, a beater roll therein, a hood inclosing said beater roll having a discharge opening therein, bracket members on said hood above and adjacent to the ends of said dis charge opening, a water supply pipe extending transversely between said bracket members, a plurality of closely spaced bars pivotally suspended from said water pipe so that they hang across said discharge opening with their free ends within the same, said water pipe having outlet openings adapted to discharge a stream of water to How along each bar, bracket devices within said hood, a supporting bar fixed transversely to and between said bracket devices, and a plurality of widely spaced bars extending downwardly from said supporting bar between said beater roll and said first mentioned closely spaced bars.

7. In a device of the kind described, a tub, a beater roll therein, a hood inclosing said beater roll having a discharge opening therein, bracket members on said hood above and adjacent to the ends of said discharge opening, a water supply pipe extending transversely between said bracket members, a plurality of closely spaced bars pivotally suspended from said water pipe so that the same hang across said discharge opening with their free ends within the same, said water pipe having outlet openings adapted to discharge a stream of water to flow along each bar, a trough exteriorly arranged relative to said discharge opening to receive pulp discharged through the interstices between said bars by centrifugal force from said beater roll, bracket devices within said hood, a supporting bar fixed transversely to and between said bracket devices, and a plurality of widely spaced bars extendin downwardly from said supporting bar etween said beater roll and said first mentioned closely spaced bars, said widely spaced 'bars having obliquely inclined portions extending in one direction, and said closely spaced bars having ob liquely inclined portions extending in the opposite direction.

8. In a device of the kind described, a tub, a beater roll therein, a hood inclosing said beater roll having a discharge opening therein, bracket members on said hood above and adjacent to the ends of said discharge opening, a water supply pipe extending transversely between said bracket members, a plurality of closely spaced bars pivotally suspended from said Water pipe so that the same hang across said discharge opening with their free ends within the same, said water pipe having outlet openings adapted to discharge a stream of water to flow along each bar, said closely spaced bars being arranged in independently movable groups, means for fixing together the bars of each group, and a trough exteriorly arranged relative to said discharge opening to receive pulp discharged through the interstices between said bars by centrifugal force from said beater roll.

9. In a device of the kind described, a tub, a beater roll therein, a hood inclosing said beater roll having a discharge opening therein, bracket members on said hood above and adjacent to the ends of said discharge opening, a water supply pipe extending transversely between said bracket members, a plurality of closely spaced bars pivotally suspended from said water pipe so that the same hang across said discharge opening with their free ends within the same, said water pipe having outlet openings adapted to discharge a stream of water to How along each bar, said closely spaced bars being arranged in independently movable groups, means for fixing together the bars of each group, a trough exteriorly arranged relative to said discharge opening to receive pulp discharged through the interstices between said bars by centrifugal force from said beater roll, bracket devices within said hood, a supporting bar fixed transversely to and between said bracket devices, and a plurality of widely spaced bars extending downwardly from said supporting bar between said beater roll and said first mentioned closely spaced bars.

10. In a device of the kind described, a tub, a beater roll therein, a hood inclosing said beater roll having a discharge opening therein, bracket members on said hood above and adjacent to the ends of saidldischarge opening, a water supply pipe extending transversely between said bracket members, a plurality of closely spaced bars pivotally suspended from said water pipe so that the same hang across said discharge opening with their free ends within the same, said water pipe having outlet openings adapted to discharge a stream of Water to lovv along each bar, said closely spaced bars being arranged in independently movable groups, means for lixiug together the bars of each group, a trough exteriorly arranged relative to said discharge opening to receive pulp discharged through the interstices between said bars by centrifugal force from said beater roll, bracket devices within said hood, a supporting bar fixed transversely to and between said bracket devices, a plurality of widely spaced bars extending downwardly from said supporting bar between said beater roll and said first mentioned closely spaced bars, said widely spaced bars having obliquely inclined portions extending in one direction, and said closely spaced bars having obliquely inclined portions extending in the opposite direction.

1l. In a device of the kind described, a tub, a beater roll therein, a hood inclosing said beater roll having a discharge opening therein, a plurality of closely spaced bars extending across said opening, said closely spaced bars being' obliquely inclined in one direction, a plurality of widely spaced bars interposed between said closely7 spaced bars and said beater roll, said widely spaced bars being obliquely inclined in an opposite direction, and a trough disposed exteriorly of said discharge opening for the purposes described.

12. In a device of the kind described, a tub, a beater roll therein, a hood inclosing said beater roll having' a discharge opening therein, a plurality of closely spaced bars extending across said opening, said closely spaced bars being obliquely inclined in one direction, a plurality of widely spaced bars interposed between said closely spaced bars and said beater roll, said widely spaced bars being obliquely inclined in an opposite direction, a trough disposed exteriorly of said discharge opening for the purposes described., and means for pivotally suspending said closely spaced bars in independently movable groups.

13. In a device of the kind described, a tub, a beater roll therein, a hood inclosing said beater roll having a discharge opening therein, a plurality of closely spaced bars extending across said opening, said closely spaced bars being obliquely inclined in one direction, a plurality of widely spaced bars interposed between said closely spaced bars and said beater roll, said widely spaced bars being' obliquely inclined in an opposite direction, a trough disposed exteriorly of said discharge opening for the purposes described, and means for pivotally suspending said closely spaced bars in independently movable groups, and means for discharging Water in downwardly flowing engagement with said closely spaced bars.

14. In a device of the kind described, a. tub, a beater roll therein, a hood inclosing said beater roll having a discharge opening therein, a plurality of closely spaced bars extending across said opening, said closely spaced bars being obliquely inclined in one direction, a plurality oi" widely spaced bars interposed between said closely' spaced bars and said beater roll, said widely spaced bars being obliqnely inclined in an opposite di* rection, a trough disposed exteriorly of said discharge opening for the purposes described, and means for discharging water in downwardly flowing engagement with said closely spaced bars.

In testimony that I claim the invention set forth above I have hereunto set my hand this 23rd day of January, 1918.

SIDNEY MITCHELL.

Witnesses:

GEORGE D. RICHARDS, ADoLPI-r HANSEN.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. 0." 

